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Reinsurance (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Catastrophe Excess of Loss    
Insurance [Abstract]    
First Event Retention Level $ 20,500 $ 20,500
Subsequent Event Retention Level 13,000 13,000
Reinsurance Retention [Line Items]    
First Event Retention Level 20,500 20,500
Subsequent Event Retention Level 13,000 13,000
American Coastal Insurance Company | Catastrophe Excess of Loss    
Insurance [Abstract]    
Reinsurance Retention Policy, Excess Retention, Amount Reinsured   1,260,000
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 1,610,000  
Event Retention Level 10,000 10,000
Reinsurance Retention [Line Items]    
Reinsurance Retention Policy, Excess Retention, Amount Reinsured   1,260,000
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 1,610,000  
Event Retention Level 10,000 10,000
American Coastal Insurance Company | All Other Perilds Catastrophe Excess of Loss    
Insurance [Abstract]    
Reinsurance, Excess Retention, Amount Reinsured, Per Policy   172,000
Reinsurance Retention [Line Items]    
Reinsurance, Excess Retention, Amount Reinsured, Per Policy   172,000
UPC Re | Catastrophe Excess of Loss    
Insurance [Abstract]    
First Event Retention Level 10,500 10,500
Subsequent Event Retention Level 3,000 3,000
Reinsurance Retention [Line Items]    
First Event Retention Level 10,500 10,500
Subsequent Event Retention Level 3,000 3,000
Interboro Insurance | Catastrophe Excess of Loss    
Insurance [Abstract]    
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 82,500  
Event Retention Level 2,500 2,500
Reinsurance Retention [Line Items]    
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 82,500  
Event Retention Level $ 2,500 $ 2,500